31340312 has 16 divisors (see below), whose sum is σ = 59370360. Its totient is φ = 15508224.

The previous prime is 31340303. The next prime is 31340317. The reversal of 31340312 is 21304313.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31340317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19418 + ... + 20969.

Almost surely, 2^31340312 is an apocalyptic number.

It is an amenable number.

31340312 is a deficient number, since it is larger than the sum of its proper divisors (28030048).

31340312 is a wasteful number, since it uses less digits than its factorization.

31340312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40490 (or 40486 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31340312 is about 5598.2418668721. The cubic root of 31340312 is about 315.2833999465.

Adding to 31340312 its reverse (21304313), we get a palindrome (52644625).

The spelling of 31340312 in words is "thirty-one million, three hundred forty thousand, three hundred twelve".